Properties of the Number -2020

Twenty

Basics

Value: -2021 → -2020 → -2019

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 4

Digital Root: 4

Palindrome: No

Factorization: 2 ² × 5 × 101

Divisors: 1, 2, 4, 5, 10, 20, 101, 202, 404, 505

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -11111100100

Octal: -3744

Duodecimal: -1204

Hexadecimal: -7e4

Square: 4080400

Square Root: 44.94441010848846

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numerator of Hermite(n, 1/13). A159488

a(n) = coefficient of xⁿ in A(x) such that C(x)² + S(x)² = 1 where: C(x) + i·S(x) = ∑_n=-oo..+oo iⁿ * (2·x)^n² * A(x)ⁿ. A357787

Row sums of A104975. A104976

E.g.f. tan(x)*sin(tanh(x))/2 (even powers only). A24241

Expansion of ∏_k>=1 1/(1 + x^k)^k-1. A319109

Doublets: base-10 representation is the juxtaposition of two identical strings. A20338

Number of monotone Boolean functions of n variables with 4 mincuts. Also Sperner systems with 4 blocks. A51112

Numbers whose sum of digits is 4. A52218

Multiples of 20 containing a 20 in their decimal representation. A121040

Representation of n in base of Catalan numbers (a classic greedy version). A14418